Abstract: The Fe5 alloy was overlaid on low carbon steel by plasma arc with longitudinal magnetic field.The scanning electron microscope, wear loss test, micro-hardness test were used to analyze the effect of magnetic field frequency on properties of surfacing metal. The results indicate that electromagnetic stirring can improve the shape and distribution of hard phase and refine the primary crystallization structure.The hardness and wear resistantance vary with magnetic field frequency.The properties of surfacing metal are improved when the magnetic field frequency in an optimal value.